Yep , it seems that doesn't matter how many weeks.. so the reward will be the same if 50 posts were reached.
") The stakes will be distributed weekly to the participants
2) All members need to post at least 50 posts by the time the ICO ends to be eligible for a reward. This means that members participating today have 9 weeks to meet the criteria, while last week ones have only one week.
3) The stakes will be distributed weekly in the following ratio:
Legendary/Hero : 2 Stakes
Sr./Full : 1.5 stakes
Member: 1 Stake "
Edit: Thanks maxxxxxx